A wastewater zero-discharge recycling treatment device and recycling treatment process

Abstract

The present invention discloses a sewage zero-discharge recycling treatment device and recycling treatment process, which relates to the technical field of sewage treatment, including a box body, a water inlet and a water outlet are arranged on the box body, and a preliminary filter component is arranged near the water inlet inside the box body, and a secondary filter component is arranged near the water outlet inside the box body; the secondary filter component includes an arc filter, a first cleaning member and a second cleaning member, the arc filter is fixedly arranged near the water outlet in the box body, and the arc filter divides the box body into a first treatment area and a second treatment area; the first cleaning member and the second cleaning member are both located in the first treatment area. The present invention is novel in design and simple in operation. Through the arrangement of the preliminary filter component and the secondary filter component, the first filter component can perform preliminary filtering treatment on the sewage, and the secondary filter component can perform a second filtering treatment on the sewage, and the filtering treatment effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a sewage zero-discharge recycling treatment device and a recycling treatment process. Background Art

[0002] With the rapid development of my country's economy, the development of science and technology, and the improvement of people's living standards, the discharge volume of industrial and domestic sewage is also increasing, and water resources are extremely precious. If sewage is discharged arbitrarily, it will have a bad impact on the environment and resources. High-salt and high-concentration organic sewage has complex components, among which toxic organic compounds pose a huge threat to human health. Phenols in sewage can cause damage to the human nervous system, causing dizziness, headaches, anxiety and other neurological symptoms. Heavy metals in sewage enter the human body through the food chain and cause damage to the brain, nervous system, cardiovascular and liver, and this damage is irreversible. Aromatic compounds in sewage can cause great harm to the human central nervous system, hematopoietic organs and reproductive system. High-salt and high-concentration organic sewage can directly cause plant cells to lose water, affect the normal growth of plants and even cause death. High-salt and high-concentration organic sewage can cause serious harm to soil and water bodies. After sewage enters the soil, a large amount of inorganic salts cause soil salinization, which changes the soil pH and salt content, affects the physical and chemical properties of the soil, and causes the soil fertility to decline, which is not conducive to farming.

[0003] The patent document (authorization announcement number CN 214654125 U) discloses a sewage recycling treatment device, which has the function of multiple filtrations through the multi-level filtering structure, and has the function of efficient and non-stop continuous operation through the filtering conveyor belt, which can better treat the recycled sewage.

[0004] However, when the above device is in use, the sewage is filtered in turn by using the filter conveyor belt 1 and the filter conveyor belt 2. The filter conveyor belt 1 and the filter conveyor belt 2 can block foreign matter in the sewage. However, in long-term filtering work, if the sewage contains impurity particles with the same size as the filter holes on the filter conveyor belt 1, they will flow with the sewage to the filter conveyor belt 1 and be stuck in the filter holes. In the subsequent filtering treatment, the filtering effect of the filter conveyor belt 1 will deteriorate. At the same time, in the long-term sewage treatment process, the inner wall of the reaction tank will be attached with impurities such as dirt remaining in the sewage. During the maintenance of the reaction tank, the staff is required to specially clean the inner wall of the reaction tank, which is troublesome. For this reason, a sewage zero-discharge recovery treatment device and a recovery treatment process are disclosed. Summary of the invention

[0005] The purpose of the present invention is to provide a sewage zero-discharge recovery treatment device and a recovery treatment process.

[0006] The technical problems solved by the present invention are:

[0007] (1) During long-term use of the filter conveyor belt in the prior art, if the sewage contains impurity particles of the same size as the filter holes on the filter conveyor belt, the impurity particles will flow along with the sewage to the filter conveyor belt and get stuck in the filter holes. In the subsequent filtering process, the filtering effect of the filter conveyor belt will deteriorate.

[0008] (2) During the long sewage treatment process, impurities such as dirt remaining in the sewage will adhere to the inner wall of the reaction tank. During the maintenance of the reaction tank, staff are required to clean the inner wall of the reaction tank specifically, which is time-consuming, labor-intensive and inconvenient to operate.

[0009] The purpose of the present invention can be achieved through the following technical solutions:

[0010] A sewage zero-discharge recycling and treatment device comprises a box body, wherein the box body is provided with a water inlet and a water outlet, and a primary filtering component is provided near the water inlet inside the box body, and a secondary filtering component is provided near the water outlet inside the box body;

[0011] The secondary filtration assembly includes an arc-shaped filter, a first cleaning piece and a second cleaning piece. The arc-shaped filter is fixedly arranged in a position close to the water outlet in the casing, and the arc-shaped filter divides the casing into a first processing area and a second processing area. The first cleaning piece and the second cleaning piece are both located in the first processing area, and the first cleaning piece is movably arranged on the inner wall of the casing, and the first cleaning piece is used to clean the arc-shaped filter, and the second cleaning piece is fixedly arranged on the first cleaning piece, and the second cleaning piece is used to clean the inner wall of the casing.

[0012] As a further solution of the present invention: the first cleaning member includes a rotating rod, a supporting rod and a plurality of cleaning wheels, one end of the rotating rod is movably mounted on the inner wall of the box body, the supporting rod is fixedly mounted on the other end of the rotating rod, the plurality of cleaning wheels are all arranged on the supporting rod, and the plurality of cleaning wheels are arranged along the length direction of the supporting rod.

[0013] As a further solution of the present invention: the first cleaning member also includes multiple fixed cylinders and multiple movable rods, the multiple fixed cylinders are arranged along the length direction of the load-bearing rod and are all installed on the load-bearing rod, the multiple movable rods are respectively arranged in a one-to-one correspondence with the multiple fixed cylinders, one ends of the multiple movable rods are respectively movably inserted in the corresponding fixed cylinders, a first spring fixedly connected to the movable rod is arranged in the fixed cylinder, the multiple cleaning wheels are respectively arranged in a one-to-one correspondence with the multiple movable rods, and the multiple cleaning wheels are respectively rotatably installed on the other end of the corresponding movable rod.

[0014] As a further solution of the present invention: an adjustment groove is provided on the bearing rod, the fixing tube is slidably mounted on the adjustment groove, and a fastening bolt for locking the fixing tube is provided on the adjustment groove.

[0015] As a further solution of the present invention: a limiting groove is provided on the inner side wall of the fixing cylinder, a limiting pin is slidably installed on the limiting groove, and the movable rod is fixedly connected to the limiting pin.

[0016] As a further solution of the present invention: a plurality of protrusions are circumferentially mounted on the cleaning wheel, and the plurality of protrusions are all arranged with smooth curve transitions.

[0017] As a further solution of the present invention: the second cleaning member includes two baffles and two scraper plates, docking brackets are fixedly arranged on both sides of the rotating rod, the two baffles are respectively arranged in one-to-one correspondence with the two docking brackets, and the two baffles are respectively detachably installed on the corresponding docking brackets; the two scraper plates are respectively vertically slidably installed on the two side walls of the box body, and a second spring fixedly connected to the scraper plate is arranged on the inner wall of the box body, the two baffles are respectively arranged in one-to-one correspondence with the two scraper plates, and the two baffles are respectively located above the corresponding scraper plates.

[0018] As a further solution of the present invention: a vertically arranged slide groove is opened on the inner wall of the box body, a slider is slidably installed on the slide groove, and a scraper plate is fixedly installed on the slider; one end of the second spring is arranged on the bottom inner wall of the slide groove, and the other end is fixedly connected to the scraper plate; a brush is arranged on one side of the scraper plate close to the inner wall of the box body along its length direction.

[0019] As a further solution of the present invention: the preliminary filtration component includes a filter frame, the filter frame is located in the first processing area, and the filter frame is horizontally slidably installed inside the box body, and a water inlet pipe is fixedly provided on the water inlet, and the water inlet pipe is located above the filter frame.

[0020] A wastewater zero-discharge recycling treatment process, the specific steps of the process are:

[0021] Step 1: Close the water outlet on the box, and transport a certain amount of sewage to be treated into the box through the water inlet pipe. The sewage will be initially filtered through the filter frame;

[0022] Step 2: The sewage after preliminary filtration will flow into the first treatment area, where flocculants are added. The metal ions in the sewage will react with the flocculants to form water-insoluble flocculent precipitates.

[0023] Step 3: Open the water outlet on the box, and the sewage in the first treatment area will pass through the arc filter to the second treatment area. During this process, the arc filter will perform secondary filtration treatment on the sewage containing flocculent precipitation and impurities, and the sewage after secondary filtration will flow out through the water outlet;

[0024] Step 4: After the sewage is discharged through the outlet, the rotating rod is driven to rotate. The rotating rod can drive multiple cleaning wheels to move. Multiple cleaning wheels can clean the arc filter. At the same time, the rotation of the rotating rod can drive the baffle to move downward. The baffle will press the scraper plate to move downward. During the downward movement of the scraper plate, the inner wall of the box will be cleaned and scraped to facilitate the next work.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. Through the setting of the primary filtering component and the secondary filtering component, the first filtering component can perform a preliminary filtering treatment on the sewage, and the secondary filtering component can perform a second filtering treatment on the sewage, and the filtering treatment effect is good;

[0027] 2. Through the setting of the first cleaning member, after the sewage treatment is completed, the rotating rod can be driven to rotate, and the rotation of the rotating rod drives multiple cleaning wheels to roll on the arc filter. The rolling of multiple cleaning wheels on the arc filter can press and discharge the debris stuck in the holes of the arc filter, which is convenient for the subsequent filtering work of the arc filter. The discharged debris will fall into the first treatment area, and the cleaning effect is good;

[0028] 3. Through the setting of the second cleaning member, in the process of driving the rotating rod to rotate, the rotation of the rotating rod can drive the baffle to move from top to bottom, and the downward movement of the baffle will press and drive the scraper plate to move downward. The downward movement of the scraper plate will clean and scrape the debris on the inner wall of the box body, and the scraped debris will fall into the first processing area. In the subsequent cleaning, the staff can centrally process the debris in the first processing area, which is convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings.

[0030] Figure 1 It is a schematic cross-sectional view of the normal working state of the present invention;

[0031] Figure 2 It is a schematic diagram of the cross-sectional structure when the filter frame of the present invention is moved out of the box body;

[0032] Figure 3 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 4 It is a partial overall structural schematic diagram of the present invention;

[0034] Figure 5 It is a schematic diagram of the partial overall structure of the box body in the present invention;

[0035] Figure 6 It is a schematic diagram of the overall structure of the first cleaning member and the second cleaning member in the present invention;

[0036] Figure 7 It is a schematic diagram of the overall structure of the scraper plate in the present invention;

[0037] Figure 8 The cross-sectional structure diagram of the fixed cylinder and the movable rod in the present invention is shown in FIG. Figure 1 ;

[0038] Fig. 9 The cross-sectional structure diagram of the fixed cylinder and the movable rod in the present invention is shown in FIG. Figure 2 ;

[0039] Fig.10 It is a schematic diagram of the side view structure of the cleaning wheel in the present invention.

[0040] In the figure: 1. box body; 2. water outlet; 3. secondary filter assembly; 4. arc filter; 5. rotating rod; 6. load-bearing rod; 7. cleaning wheel; 8. fixed cylinder; 9. movable rod; 10. first spring; 11. adjustment groove; 12. fastening bolt; 13. limit groove; 14. limit pin; 15. bump; 16. baffle; 17. scraper plate; 18. docking bracket; 19. second spring; 20. slide groove; 21. brush; 22. filter frame; 23. water inlet pipe; 24. pin shaft; 25. L-shaped handle. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] like Figure 1-Figure 10 As shown, a sewage zero-discharge recovery and treatment device comprises a housing 1, wherein the housing 1 has a water inlet and a water outlet 2, and a water inlet pipe 23 is fixedly arranged on the water inlet for supplying sewage into the housing 1; a preliminary filtering component is arranged near the water inlet inside the housing 1, and the preliminary filtering component can perform preliminary filtering treatment on the sewage; a secondary filtering component 3 is arranged near the water outlet 2 inside the housing 1, and the secondary filtering component 3 can perform re-filtering treatment on the sewage filtered and treated by the preliminary filtering component; the treated sewage will be discharged through the water outlet 2, and in order to facilitate the discharge of sewage, a plurality of water outlets 2 are arranged, and the discharged sewage can be subsequently treated.

[0043] like Figure 1-Figure 2As shown, for the setting of the preliminary filtering component mentioned above, the preliminary filtering component includes a filter frame 22, the filter frame 22 is horizontally slidably installed in the box body 1, and the water inlet pipe 23 is located above the filter frame 22. When the water inlet pipe 23 supplies sewage to the box body 1, the sewage will first pass through the filter frame 22 and then be discharged from the filter frame 22. The filter frame 22 can filter large particles of debris in the sewage. After the sewage treatment is completed, the staff can pull the filter frame 22 horizontally to the left, and then take out the large particles of debris collected in the filter frame 22.

[0044] Regarding the setting of the secondary filter component 3, the secondary filter component 3 includes an arc filter screen 4, which is fixedly arranged in the box body 1 at a position close to the water outlet 2. The arc filter screen 4 divides the box body 1 into a first treatment area and a second treatment area. The sewage filtered by the filter frame 22 will be discharged to the first treatment area, and the sewage in the first treatment area will flow to the second treatment area through the arc filter screen 4. During this process, the arc filter screen 4 will further filter the sewage, and the filtered sewage will be discharged through multiple water outlets 2 for subsequent treatment procedures.

[0045] During the long-term sewage treatment work of the arc filter 4 and the box body 1, debris and dirt will be attached to the inner walls of the arc filter 4 and the box body 1, and then the secondary filter component 3 is set to also include a first cleaning piece and a second cleaning piece, the first cleaning piece and the second cleaning piece are both located in the first treatment area, the first cleaning piece is movably arranged on the inner wall of the box body 1, and the first cleaning piece is used to clean the arc filter 4, the second cleaning piece is fixedly arranged on the first cleaning piece, and the second cleaning piece is used to clean the inner wall of the box body 1.

[0046] like Figure 4 and Figure 6 As shown, for the setting of the first cleaning member, the first cleaning member includes a rotating rod 5, a carrying rod 6 and a plurality of cleaning wheels 7. One end of the rotating rod 5 is movably mounted on the inner side wall of the box body 1. Specifically, a pin shaft 24 is fixedly inserted on the end of the rotating rod 5. The pin shaft 24 is rotatably mounted on the box body 1, and in order to facilitate the rotation of the pin shaft 24, one end of the pin shaft 24 is arranged to pass through the box body 1, and an L-shaped handle 25 is fixedly arranged on the pin shaft 24 at a position outside the box body 1. Driving the L-shaped handle 25 can drive the pin shaft 24 and the rotating rod 5 to rotate; the carrying rod 6 is fixedly mounted on the other end of the rotating rod 5, and the plurality of cleaning wheels 7 are all arranged on the carrying rod 6, and the plurality of cleaning wheels 7 are arranged along the length direction of the carrying rod 6. During normal operation, the plurality of cleaning wheels 7 will be in a pressed state with the arc filter screen 4. This state is as shown in FIG. Figure 1-Figure 2As shown; specifically, the first cleaning member also includes a plurality of fixed cylinders 8 and a plurality of movable rods 9, the plurality of fixed cylinders 8 are arranged along the length direction of the bearing rod 6 and are all installed on the bearing rod 6, the plurality of movable rods 9 are respectively arranged in a one-to-one correspondence with the plurality of fixed cylinders 8, and one end of the plurality of movable rods 9 is respectively movably inserted on the corresponding fixed cylinders 8; the plurality of cleaning wheels 7 are respectively arranged in a one-to-one correspondence with the plurality of movable rods 9, and the plurality of cleaning wheels 7 are respectively rotatably installed on the other end of the corresponding movable rods 9; in order to make the plurality of cleaning wheels 7 and the arc filter 4 press tightly, a first spring 10 fixedly connected to the movable rod 9 is arranged in the fixed cylinder 8, when the plurality of cleaning wheels 7 and the arc filter 4 are in a pressing state, the first spring 10 is in a compressed state, under the elastic action of the first spring 10, the plurality of cleaning wheels 7 will press tightly against the arc filter 4, and when the rotating rod 5 drives the plurality of cleaning wheels 7 to move, the cleaning wheels 7 will move close to the arc filter 4, and the cleaning wheels 7 can clean the arc filter 4.

[0047] like Figure 6 As shown, in order to facilitate the adjustment of the position of the cleaning wheel 7 on the supporting rod 6, an adjustment groove 11 is opened on the supporting rod 6, and the fixing cylinder 8 is slidably installed on the adjustment groove 11, and a fastening bolt 12 for locking the position of the fixing cylinder 8 is provided on the adjustment groove 11. By loosening the fastening bolt 12, the position of the cleaning wheel 7 can be moved. When the cleaning wheel 7 is moved to the specified position, the fastening bolt 12 can be tightened, and then the position of the fixing cylinder 8 and the cleaning wheel 7 will be locked.

[0048] like Figure 8-Figure 9 As shown, in order to prevent the movable rod 9 from moving out of the fixed cylinder 8, a limiting groove 13 is opened on the inner wall of the fixed cylinder 8, and a limiting pin 14 is slidably installed on the limiting groove 13. The movable rod 9 is fixedly connected with the limiting pin 14. In the process of multiple cleaning wheels 7 moving with the rotating rod 5, the limiting pin 14 is limited by the limiting groove 13, so that the movable rod 9 will only move on the fixed cylinder 8 and will not move out of the fixed cylinder 8.

[0049] like Figure 9-10 As shown, in order to enable the cleaning wheel 7 to better clean the arc filter 4, a plurality of protrusions 15 are installed on the circumference of the cleaning wheel 7, and the plurality of protrusions 15 are all arranged with smooth curve transitions. When the cleaning wheel 7 and the arc filter 4 rotate in engagement, the plurality of protrusions 15 will press the debris in the holes of the arc filter 4 out of the holes.

[0050] Again Figure 4 and Figure 6 As shown, for the above-mentioned second cleaning member, the second cleaning member includes two baffles 16 and two scraper plates 17, and docking brackets 18 are fixedly arranged on both sides of the rotating rod 5. Figure 6It can be seen that the docking bracket 18 is composed of two relatively parallel cross bars, one end of each of which is fixedly mounted on the rotating rod 5; the two baffles 16 are respectively arranged in a one-to-one correspondence with the two docking brackets 18, and the two baffles 16 are respectively detachably mounted on the corresponding docking brackets 18; the two scraper plates 17 are respectively vertically slidably mounted on the two side walls of the box body 1, and a second spring 19 fixedly connected to the scraper plates 17 is arranged on the inner wall of the box body 1, the two baffles 16 are respectively arranged in a one-to-one correspondence with the two scraper plates 17, and the two baffles 16 are respectively located above the corresponding scraper plates 17. Specifically, a vertically arranged slide groove 20 is provided on the inner wall of the box body 1, a slider is slidably mounted on the slide groove 20, and the scraper plate 17 is fixedly mounted on the slider; one end of the second spring 19 is arranged on the bottom inner wall of the slide groove 20, and the other end is fixedly connected to the scraper plate 17, in Figure 4-Figure 5 In the state shown, the second spring 19 is in a normal state. When the rotating rod 5 rotates downward, the baffle 16 will be driven to rotate downward. Since the baffle 16 is located above the scraper plate 17, the downward movement of the baffle 16 will press the scraper plate 17 to move downward. The downward movement of the scraper plate 17 will clean and scrape the inner wall of the box body 1. At this time, the second spring 19 will be compressed. When the rotating rod 5 is driven to return to Figure 4 In the state, under the elastic action of the second spring 19, the scraper plate 17 will be driven to move upward to the initial position; Figure 7 As shown, in order to make the scraper plate 17 have a better cleaning and scraping effect on the inner wall of the box body 1, a brush 21 is provided along the length direction of the scraper plate 17 on one side close to the inner wall of the box body 1. When the scraper plate 17 moves downward, the scraper plate 17 drives the brush 21 to move downward. In the process of the brush 21 moving downward, the inner wall of the box body 1 is cleaned and scraped more closely. Figure 4-Figure 5 It is shown in the figure that the length of the scraper plate 17 is smaller than the length of the inner wall of the box body 1. In actual use, the length of the scraper plate 17 can be set to be equal to the length of the inner wall of the box body 1, so that the inner wall of the box body 1 can be completely and better cleaned and scraped during the downward movement of the scraper plate 17.

[0051] A wastewater zero-discharge recycling process, the specific steps of the process are:

[0052] Step 1: Close the water outlet 2 on the box 1, and transport a certain amount of sewage to be treated into the box 1 through the water inlet pipe 23. The sewage will be initially filtered through the filter frame 22; after the subsequent sewage treatment is completed, the filter frame 22 can be pulled to the left, and the staff can clean up the debris filtered in the filter frame 22;

[0053] Step 2: The sewage after the preliminary filtration treatment will flow into the first treatment area. At this time, flocculants are added in the first treatment area. The metal ions in the sewage will react with the flocculants to form flocculent precipitation that is insoluble in water. Of course, the addition of agents is not limited to the addition of flocculants, and other agents for treating sewage can also be added;

[0054] Step 3: After the reagent is added, wait for a while, then open the water outlet 2 on the box 1, and the sewage in the first treatment area will pass through the arc filter 4 to reach the second treatment area. During this process, the arc filter 4 will perform secondary filtration treatment on the sewage containing flocculent precipitation and impurities, and block the flocculent precipitation and impurities in the first treatment area. The sewage after the secondary filtration treatment will flow out through the water outlet 2, and the sewage after flowing out can be subjected to subsequent treatment procedures;

[0055] Step 4: After the sewage is discharged through the outlet 2, the staff can drive the L-shaped handle 25 to rotate, and then drive the rotating rod 5 to rotate. The rotating rod 5 can drive multiple cleaning wheels 7 to move, and the multiple cleaning wheels 7 can roll on the arc filter 4 to clean the arc filter 4. At the same time, the rotation of the rotating rod 5 can drive the baffle 16 to move downward, and the baffle 16 will press the scraper plate 17 to move downward. During the downward movement of the scraper plate 17, the inner wall of the box body 1 will be cleaned and scraped to facilitate the next work.

[0056] Working principle of the present invention: When treating sewage, a certain amount of sewage is transported to the filter frame 22 through the water inlet pipe 23. The filter frame 22 will perform preliminary filtering treatment on the sewage. The sewage preliminarily filtered by the filter frame 22 will be transported to the first treatment area, and then flocculants and other agents can be added to the first treatment area. The flocculants will react with the metal ions in the sewage to generate water-insoluble flocculent precipitation. When the sewage flows from the first treatment area to the second treatment area, the flocculent precipitation and impurities in the sewage will be blocked by the arc filter 4, and the sewage can pass through the arc filter 4 and be discharged from the box 1 through the water outlet 2. After the sewage treatment is completed, the staff can pull the filter frame 22 to the left to Figure 2 The state shown, and then the large particles of debris in the filter frame 22 are cleaned. After cleaning, the staff can rotate the L-shaped handle 25. The rotation of the L-shaped handle 25 can rotate the pin 24 and the rotating rod 5, and then the rotating rod 5 will drive the multiple cleaning wheels 7 and the two scraper plates 17 to move. The movement of the multiple cleaning wheels 7 can clean the arc filter 4, and the movement of the two scraper plates 17 can clean and scrape the inner wall of the box body 1. After cleaning, the cleaned debris falls into the first processing area, and then the staff can drive the multiple cleaning wheels 7 and the two scraper plates 17 to reset. The subsequent staff will centrally clean the cleaned debris, flocculent precipitation and impurities in the first processing area.

[0057] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A sewage zero-discharge recovery and treatment device, comprising a housing (1), characterized in that: The box body (1) is provided with a water inlet and a water outlet (2), and a primary filter component is provided at a position close to the water inlet inside the box body (1), and a secondary filter component (3) is provided at a position close to the water outlet (2) inside the box body (1); The secondary filtering assembly (3) comprises an arc-shaped filter screen (4), a first cleaning member and a second cleaning member; the arc-shaped filter screen (4) is fixedly arranged in a position close to the water outlet (2) in the casing (1); the arc-shaped filter screen (4) divides the casing (1) into a first processing area and a second processing area; the first cleaning member and the second cleaning member are both located in the first processing area; the first cleaning member is movably arranged on the inner side wall of the casing (1), and the first cleaning member is used to clean the arc-shaped filter screen (4); the second cleaning member is fixedly arranged on the first cleaning member, and the second cleaning member is used to clean the inner side wall of the casing (1); The first cleaning member comprises a rotating rod (5), a bearing rod (6) and a plurality of cleaning wheels (7), one end of the rotating rod (5) being movably mounted on the inner wall of the box body (1), the bearing rod (6) being fixedly mounted on the other end of the rotating rod (5), the plurality of cleaning wheels (7) being arranged on the bearing rod (6), and the plurality of cleaning wheels (7) being arranged along the length direction of the bearing rod (6); The first cleaning member further comprises a plurality of fixed cylinders (8) and a plurality of movable rods (9); the plurality of fixed cylinders (8) are arranged along the length direction of the bearing rod (6) and are all mounted on the bearing rod (6); the plurality of movable rods (9) are respectively arranged in one-to-one correspondence with the plurality of fixed cylinders (8); one end of the plurality of movable rods (9) is respectively movably inserted in the corresponding fixed cylinders (8); a first spring (10) fixedly connected to the movable rod (9) is arranged in the fixed cylinders (8); the plurality of cleaning wheels (7) are respectively arranged in one-to-one correspondence with the plurality of movable rods (9), and the plurality of cleaning wheels (7) are respectively rotatably mounted on the other end of the corresponding movable rod (9); The second cleaning member comprises two baffles (16) and two scraper plates (17); docking brackets (18) are fixedly arranged on both sides of the rotating rod (5); the two baffles (16) are respectively arranged in one-to-one correspondence with the two docking brackets (18), and the two baffles (16) are respectively detachably mounted on the corresponding docking brackets (18); the two scraper plates (17) are respectively vertically slidably mounted on the two side walls of the box body (1), and a second spring (19) fixedly connected to the scraper plates (17) is arranged on the inner side wall of the box body (1); the two baffles (16) are respectively arranged in one-to-one correspondence with the two scraper plates (17), and the two baffles (16) are respectively located above the corresponding scraper plates (17); A vertically arranged slide groove (20) is provided on the inner side wall of the box body (1), a slider is slidably mounted on the slide groove (20), and a scraper plate (17) is fixedly mounted on the slider; one end of a second spring (19) is arranged on the bottom inner wall of the slide groove (20), and the other end is fixedly connected to the scraper plate (17); a brush (21) is provided on one side of the scraper plate (17) close to the inner side wall of the box body (1) along its length direction.

2. A sewage zero-discharge recovery and treatment device according to claim 1, characterized in that: The bearing rod (6) is provided with an adjustment groove (11), the fixing cylinder (8) is slidably mounted on the adjustment groove (11), and a fastening bolt (12) for locking the fixing cylinder (8) is provided on the adjustment groove (11).

3. A sewage zero-discharge recovery and treatment device according to claim 2, characterized in that: The inner side wall of the fixed cylinder (8) is provided with a limit groove (13), a limit pin (14) is slidably mounted on the limit groove (13), and the movable rod (9) is fixedly connected to the limit pin (14).

4. A sewage zero-discharge recovery and treatment device according to claim 3, characterized in that: A plurality of protrusions (15) are mounted on the upper circumference of the cleaning wheel (7), and the plurality of protrusions (15) are all arranged in a smooth curve transition.

5. The sewage zero-discharge recovery and treatment device according to claim 1 is characterized in that: The preliminary filtering assembly comprises a filtering frame (22), the filtering frame (22) being located in the first processing area, and the filtering frame (22) being horizontally slidably mounted inside the box body (1), and a water inlet pipe (23) being fixedly arranged on the water inlet, and the water inlet pipe (23) being located above the filtering frame (22).

6. A recycling process using the wastewater zero-discharge recycling device according to claim 5, characterized in that: The specific steps of this process are: Step 1: close the water outlet (2) on the box (1), and transport a certain amount of sewage to be treated into the box (1) through the water inlet pipe (23), and the sewage will be initially filtered through the filter frame (22); Step 2: The sewage after preliminary filtration will flow into the first treatment area, where flocculants are added. The metal ions in the sewage will react with the flocculants to form water-insoluble flocculent precipitates. Step 3: Open the water outlet (2) on the box (1), and the sewage in the first treatment area will pass through the arc filter (4) to reach the second treatment area. During this process, the arc filter (4) will perform secondary filtration treatment on the sewage containing flocculent sediment and impurities, and the sewage after the secondary filtration treatment will flow out through the water outlet (2); Step 4: After the sewage is discharged through the water outlet (2), the rotating rod (5) is driven to rotate, and the rotating rod (5) can drive the plurality of cleaning wheels (7) to move. The plurality of cleaning wheels (7) can clean the arc filter (4). At the same time, the rotation of the rotating rod (5) can drive the baffle plate (16) to move downward, and the baffle plate (16) will press the scraper plate (17) to move downward. During the downward movement of the scraper plate (17), the inner wall of the box body (1) will be cleaned and scraped, so as to facilitate the next work.

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